How to Install Oracle JDK 7 on Lubuntu 14.04 Trusty LTS 32-64bit Easy Visual-Guide

Oracle Java JDK 7 Quick Start Lubuntu 14.04 Trusty LTS 32/64-bit

The Guide shows you in Easy-Steps How to Install and Getting-Started with the Oracle-Sun Official Java SE JDK 7 for Lubuntu 14.04 Trusty Tahr LTS i386/amd64 Desktop Linux.

To SetUp Oracle JDK you will need to Use the update-alternatives Tool to Update your System Java to 1.7 JDK.

To the How to Download and Install Oracle JDK 8+ on Lubuntu 14.04 Trusty Bottom there is a Link for Quick Start with Java JDK 7 Development and also to Install the Java Web-Server Tomcat 7 for Lubuntu Linux.

The Contents and Details of How to Download and Install Oracle JDK 8+ on Lubuntu 14.04 Trusty are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands and Make the Tut Easier to Understand ;)

1. Download Oracle Java SE JDK for Linux.

   Oracle JDK i586/x8664 tar.gz

   Select Oracle JDK 7 for Linux

2. Double-Click on the tar.gz Archive and Extract into/tmp
   Or from Shell:

   tar xvzf ~/Downloads/jdk-7*.tar.gz -C /tmp/

   

3. Open a Command Line Terminal Window
   Ctrl+Alt+t
   (Press “Enter” to Execute Commands).

   

4. Relocate JDK 7

   sudo su

   If Got “User is Not in Sudoers file” then see: How to Enable sudo
   To Make a jvm Directory Only if Not already there
   (You can directly copy & paste the commands into the terminal)

   if [ ! -d "/usr/lib/jvm" ]; then mkdir /usr/lib/jvm; fi

   Set the root superUser as owner

   sudo chown -R root:root /tmp/jdk1.7*

   Then to shift the Oracle JDK 7 contents

   mv /tmp/jdk1.7* /usr/lib/jvm/
   

5. Installing Oracle Java JDK 7

   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7*/bin/java 1065
   

   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7*/bin/javac 1065
   

   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7*/bin/jar 1065
   

   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7*/bin/javaws 1065
   

   Checking or Setting the System Java Version in Use
   with

   update-alternatives --config java

   And for the Java Compiler instead:

   sudo update-alternatives --config javac

   To Switch of Java Version Just Enter the Selection Number on First, Column. :)
   Last Achieve the SuperUser session:

   exit

6. Setting JAVA_HOME User Environment Variable (Optional).

   su [myUserName]

   Or simply:

   exit

   And Edit the Bash environment Configuration file

   nano $HOME/.bashrc

   Append:

   export JAVA_HOME=/usr/lib/jvm/jdk1.7[uX]

   Replace the [uX] Looking for the Installed Java 7 Version with:

   ls /usr/lib/jvm/

   Ctr+x to Save & Exit from nano Editor :)
   Load New Bash Config:

   bash

7. Testing New Java JDK 7 Installation:

   java -version

8. Getting-Started with Java Development.

   Getting-Started Quickly with JDK

   How-to
   Getting-Started Quickly with Java JDK Development

How to Install Eclipse for Java Developers on Lubuntu

Install Eclipse Java for Lubuntu
The Linked Guide Includes Tutorials for Installing Latest Eclipse Java on Lubuntu

Now Thanks to Oracle-Sun Corporation you are able to Successfully Start with Java JDK Use & Development.